1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11
12 // std::ranges::dangling;
13
14 #include <ranges>
15
16 #include <concepts>
17 #include <type_traits>
18
19 static_assert(std::is_empty_v<std::ranges::dangling>);
20
21 template<int> struct S { };
22 static_assert(std::is_nothrow_constructible_v<std::ranges::dangling>);
23 static_assert(std::is_nothrow_constructible_v<std::ranges::dangling, S<0>>);
24 static_assert(std::is_nothrow_constructible_v<std::ranges::dangling, S<0>, S<1>>);
25 static_assert(std::is_nothrow_constructible_v<std::ranges::dangling, S<0>, S<1>, S<2>>);
26
test_dangling()27 constexpr bool test_dangling() {
28 [[maybe_unused]] auto a = std::ranges::dangling();
29 [[maybe_unused]] auto b = std::ranges::dangling(S<0>());
30 [[maybe_unused]] auto c = std::ranges::dangling(S<0>(), S<1>());
31 [[maybe_unused]] auto d = std::ranges::dangling(S<0>(), S<1>(), S<2>());
32 return true;
33 }
34
main(int,char **)35 int main(int, char**) {
36 static_assert(test_dangling());
37 test_dangling();
38 return 0;
39 }
40